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  • Title: Many-Body Physics of Single and Double Spin-Flip Excitations in NiO.
    Author: Nag A, Robarts HC, Wenzel F, Li J, Elnaggar H, Wang RP, Walters AC, García-Fernández M, de Groot FMF, Haverkort MW, Zhou KJ.
    Journal: Phys Rev Lett; 2020 Feb 14; 124(6):067202. PubMed ID: 32109129.
    Abstract:
    Understanding many-body physics of elementary excitations has advanced our control over material properties. Here, we study spin-flip excitations in NiO using Ni L_{3}-edge resonant inelastic x-ray scattering (RIXS) and present a strikingly different resonant energy behavior between single and double spin-flip excitations. Comparing our results with single-site full-multiplet ligand field theory calculations we find that the spectral weight of the double-magnon excitations originates primarily from the double spin-flip transition of the quadrupolar RIXS process within a single magnetic site. Quadrupolar spin-flip processes are among the least studied excitations, despite being important for multiferroic or spin-nematic materials due to their difficult detection. We identify intermediate state multiplets and intra-atomic core-valence exchange interactions as the key many-body factors determining the fate of such excitations. RIXS resonant energy dependence can act as a convincing proof of existence of nondipolar higher-ranked magnetic orders in systems for which, only theoretical predictions are available.
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